Power Point 2022
Joseph Zyiuahndy
Thanks for the post and pardon the late response. Are you facing this issue with Zoom client or Zoom SDK? If this issue happens with Zoom client, since this is out of the scope of what this forum is for(This forum is for Marketplace Apps) and we have no insight to the questions in Zoom clien, please try to contact Zoom client support at -us/requests/new and one of the Zoom experts will be happy to assist you. If this issue happens with Zoom Windows SDK, could you provide the SDK version, and the steps to reproduce this issue with our demo app?
Hi, I face the same problem. The solution suggested by Zoom Team does not work!!! The audio sounds from the Powerpoint presentation do not work in the Zoom presentation. My workaround was to just use Google Slides. You can simply import Powerpoint slides into Google which automatically convert. BUT you need to copy over any video clips from your slides and store them in google drive. You may need to do slight modification in google slides as it does not have the full feature of Powerpoint.
I realize the video performance in this manner is much better during the presentation.
I am recording video lectures, but the video recording of me is blocking aspects of the power point. The recording sits in the lower right corner of the PP screen (closed captions below that). I have set the PP to standard view so that the recording of me can sit on the margins (Panopto is recording in a wide screen format, with black margins on the left and right of the screen).
You should be able to change where your presenter view is located by adjusting the video podcast settings. By following the steps in this article, you can access the video podcast settings and adjust where your presenter window is based on the type of podcast selected: How to Change the Format and Preview the Podcast Version of Videos.
Maximum power point tracking (MPPT),[1][2] or sometimes just power point tracking (PPT),[3][4] is a technique used with variable power sources to maximize energy extraction as conditions vary. The technique is most commonly used with photovoltaic (PV) solar systems but can also be used with wind turbines, optical power transmission and thermophotovoltaics.
PV solar systems have varying relationships to inverter systems, external grids, battery banks, and other electrical loads.[5] The central problem addressed by MPPT is that the efficiency of power transfer from the solar cell depends on the amount of available sunlight, shading, solar panel temperature and the load's electrical characteristics. As these conditions vary, the load characteristic (impedance) that gives the highest power transfer changes. The system is optimized when the load characteristic changes to keep power transfer at highest efficiency. This optimal load characteristic is called the maximum power point (MPP). MPPT is the process of adjusting the load characteristic as the conditions change. Circuits can be designed to present optimal loads to the photovoltaic cells and then convert the voltage, current, or frequency to suit other devices or systems.
Solar cells' non-linear relationship between temperature and total resistance can be analyzed based on the Current-voltage (I-V) curve and the power-voltage (P-V) curves.[6][7] MPPT samples cell output and applies the proper resistance (load) to obtain maximum power.[8] MPPT devices are typically integrated into an electric power converter system that provides voltage or current conversion, filtering, and regulation for driving various loads, including power grids, batteries, or motors. Solar inverters convert DC power to AC power and may incorporate MPPT.
Photovoltaic cells have a complex relationship between their operating environment and the power they produce. The nonlinear I-V curve characteristic of a given cell in specific temperature and insolation conditions can be functionally characterized by a fill factor (FF). Fill factor is defined as the ratio of the maximum power from the cell to the product of open circuit voltage Voc and short-circuit current Isc. Tabulated data is often used to estimate the maximum power that a cell can provide with an optimal load under given conditions:
A photovoltaic cell, for the majority of its useful curve, acts as a constant current source.[11] However, at a photovoltaic cell's MPP region, its curve has an approximately inverse exponential relationship between current and voltage. From basic circuit theory, the power delivered to a device is optimized (MPP) where the derivative (graphically, the slope) dI/dV of the I-V curve is equal and opposite the I/V ratio (where dP/dV=0)[12] and corresponds to the "knee" of the curve.
A load with resistance R=V/I equal to the reciprocal of this value draws the maximum power from the device. This is sometimes called the 'characteristic resistance' of the cell. This is a dynamic quantity that changes depending on the level of illumination, as well as other factors such as temperature and cell condition. Lower or higher resistance reduces power output. Maximum power point trackers utilize control circuits or logic to identify this point.
When directly connecting a load to cell, the operating point of the panel is rarely at peak power. The impedance seen by the panel determines its operating point. Setting the impedance correctly achieves peak power. Since panels are DC devices, DC-DC converters transform the impedance of one circuit (source) to the other circuit (load). Changing the duty ratio of the DC-DC converter changes the impedance (duty ratio) seen by the cell. The I-V curve of the panel can be considerably affected by atmospheric conditions such as irradiance and temperature.
MPPT algorithms frequently sample panel voltages and currents, then adjust the duty ratio accordingly. Microcontrollers implement the algorithms. Modern implementations often utilize more sophisticated computers for analytics and load forecasting.
In this method the controller adjusts the voltage from the array by a small amount and measures power; if the power increases, further adjustments in that direction are tried until power no longer increases. This is called perturb and observe (P&O) and is most common, although this method can cause power output to oscillate.[14][15] It is also referred to as a hill climbing method, because it depends on the rise of the curve of power against voltage below the maximum power point, and the fall above that point.[16] Perturb and observe is the most commonly used method due to its ease of implementation.[14] Perturb and observe method may result in top-level efficiency, provided that a proper predictive and adaptive hill climbing strategy is adopted.[17][18]
In this method, the controller measures incremental current and voltage changes to predict the effect of a voltage change. This method requires more computation in the controller, but can track changing conditions more rapidly than P&O. Power output does not oscillate.[19] It utilizes the incremental conductance ( d I / d V \displaystyle dI/dV ) of the photovoltaic array to compute the sign of the change in power with respect to voltage ( d P / d V \displaystyle dP/dV ).[20] The incremental conductance method computes MPP by comparison of the incremental conductance ( I Δ / V Δ \displaystyle I_\Delta /V_\Delta ) to the array conductance ( I / V \displaystyle I/V ). When these two are the same ( I / V = I Δ / V Δ \displaystyle I/V=I_\Delta /V_\Delta ), the output voltage is the MPP voltage. The controller maintains this voltage until the irradiation changes and the process is repeated.
The current sweep method uses a sweep waveform for the array current such that the I-V characteristic of the PV array is obtained and updated at fixed time intervals. MPP voltage can then be computed from the characteristic curve at the same intervals.[21][22]
Constant voltage methods include one in which the output voltage is regulated to a constant value under all conditions and one in which the output voltage is regulated based on a constant ratio to the measured open circuit voltage ( V O C \displaystyle V_OC ). The latter technique may also be labeled the "open voltage" method.[23] If the output voltage is held constant, there is no attempt to track MPP, so it is not strictly a MPPT technique, though it does function in cases when MPP tracking tends to fail, and thus it is sometimes used supplementally. In the open voltage method, power delivery is momentarily interrupted and the open-circuit voltage with zero current is measured. The controller then resumes operation with the voltage controlled at a fixed ratio, such as 0.76, of the open-circuit voltage V O C \displaystyle V_OC .[24] This is usually a value that has been predetermined to be the MPP, either empirically or based on modelling, for expected operating conditions.[19][20] The array's operating point is thus kept near MPP by regulating the array voltage and matching it to the fixed reference voltage V r e f = k V O C \displaystyle V_ref=kV_OC . The value of V r e f \displaystyle V_ref may be chosen to give optimal performance relative to other factors as well as the MPP, but the central idea is that V r e f \displaystyle V_ref is determined as a ratio to V O C \displaystyle V_OC . One of the inherent approximations in the method is that the ratio of MPP voltage to V O C \displaystyle V_OC is only approximately constant, so it leaves room for further possible optimization.
This method estimates the MPP voltage ( V m p p \displaystyle V_mpp ) by measuring the temperature of the solar module and comparing it against a reference.[25] Since changes in irradiation levels have a negligible effect on the MPP voltage, its influences may be ignored - the voltage is assumed to vary linearly with temperature.
Both P&O and incremental conductance are examples of "hill climbing" methods that can find the local maximum of the power curve for the array's operating condition, and so provide a true MPP.[6][16][19]
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